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<h1>Metamaterials</h1>
Metamaterials are artificial materials engineered to have properties that may not be found in nature. The greatest potential of metamaterials is the possibility to create a structure with a negative refractive index, since this property is not found in any non-synthetic material.

<h2>External links</h2>
<ul>
<li><a href="https://en.wikipedia.org/wiki/Metamaterials">Metamaterials - Wikipedia</a></li>
<li><a href="https://en.wikipedia.org/wiki/Negative_index_metamaterials">Negative index metamaterials - Wikipedia</a></li>
</ul>
